An aluminum strip (or light steel) about 1/2" wide, cut into 4 pieces of appropriate length for the tube (in my case a hollow vinyl fence post), threaded rod (cut into 4 pieces of appropriate length), 8 nuts w/ nylon threaded centers. All from Lowe's. Oh, and two vinyl fence post caps for the ends, with a few air holes drilled in them so things could dry out, attached to the post w/ zip ties as hinges.
Mike and Kim
2012 Jayco Eagle Super Lite 308RETS, TST 507 TPMS
2010 Chevy 2500HD, Duramax/Allison, 2WD, Long Bed, Crew Cab, Duraflaps, AMP Bedstep
Equal-i-zer 1400/14K Hitch